Condensation products of the benzanthrone series and process of making same



Patented Apr. 22, 1930 I UNITEDTVS'TTATTES PATENT] oFmcE (mom KAI-150E123 Am) nnmz sennynn, or FBANKFORT-ON-TEE-MAIN, GERMANY,

ssreuoas r0 GENERAL ANILINE new or DELAWARE WORKS, 1110., OF NEW-YORK, N. Y., A CORPORA- GOHTDENSATION PRODUCTS 01' THE IBENZAl VTHRONE SERIES AND BBDGESS'OF MAKING ll'o nrawi ng Application fled. July 9, 1927, Serial No. 204,657, and in Germany September 4, 1926.

Our invention relates to new condensation products of the benzanthrone series, and to a process of preparing the same. More particularly it relates to. the compounds of the general formula:

a free orthoorpara-position. In order toavoid the formation of dibenzanthrone com- 1 pounds advantageously only such an amount of caustic alkalies should be added, which is necessary for the formation of phenolate,

taking -care of not exceeding essentially-this quantity. Y r

or, mostly soluble in an alcoholiccaustic alkali solution to intensely colored solutions.

The may be used as intermediates for the pro uction of d estufis. v

In order to rther-illustrate our invention the following cram les are given, the parts being by weight an all-temperatures in centigrade degrees, but-itls understood, that our invention is not limited to the particular products or reacting conditions mentioned therein.

' At about 140, 200 parts of benzanthrone are introduced into amixture of 200 parts of B-naphtol and 78 parts oi-caustie potash. Then the mass is heated to about 200 and maintained at this temperature for some.

hours while stirring. The hot mass is poured into water and the separated reaction product is filtered off. It may be freed from unchanged benzanthrone by extracting it with boiling glacialv acetic acid. The new compound having probably the formula:

crystallizes from nitrobe'nzene in bright yel-' low ne'edlessoluble in concentrated sulfuric acid with a red color (without fluorescence) The substance turns red when heated to about 260 and melt above 300, it dissolves in an alcoholic caustic soda solution with a red color. 2 Instead of ,B-na hthol its substitution products may be used or our process, for instance 6-bromo-2-naphthol yields an analogous product, crystallizing inyellowish brown colored crystals, soluble in concentrated sulfuric acid with a some more red dish color. 7

' Analo ous stead ofianzanthrone its substitution products having a free 2-position are condensed in the same manner with ,B-naphthol, so for instance fi-chlorobenzanthrone' yields when v V products are obtainable, ifin- I condensed with B-na hthol a yellowish colored product, easily so uble in 'hotorganic 'solvents. Similar products are obtainable by starting from methylderivativesof benzanthrone, for instance 6-methylbenzanthrone, 1n 7 the same manner h droxyand amino-derivatives may be use ',f01 our process, yielding analogous condensation products.

Ewample 2 l' miizture of 200 parts of a-naphthol and of parts of caustic potash is heated to about 200 and then while stirring 20 parts of ben-j A zanthrone are added. The mass is kept for some hours at this temperature and the reac- ,B-naphthol. When recrystallized from nitrobenzene it forms yellow prisms, melting above 300. Its solution in concentrated sulfuric acid is reddish colored. By replacing a-naphthol by its substitution products, for instance 2-chloro-1-naphthol a similar condensation product is obtained, being when dry a brown powder, melting above 300, soluble in hot nitrobenzene, the solution showing a reddish fluorescence; its solution in concentrated sulfuric acid is brownish red colored with a yellowish fluorescence.

WVhen replacing the benzanthrone by the corresponding uantity of the benzobenzanthrone-carboxylic acid of the formula:

coon

an analogous product of condensation is obtained, forming a brown colored powder, yielding with concentrated sulfuric acid a dark brown colored solution, being difficultly soluble in organic solvents of a higher boiling point with a brownish color.

EwampZe 3 By replacing in the process described in the foregoing example the a-naphthol by 225 parts of vicinal meta-xylenol a corresponding fproduct is obtained, having ormula:

condensation probably the It is when dry a pure yellow powder, soluble in concentrated sulfuric acid with an orangered, in an alcoholic caustic soda solution with a violet color. It crystallizes from nitrobenzene as compact yellow prisms.

We claim: Y I y I '1; As new products condensation products of the benzanthrone series, corresponding most probably to the general formula:

.wherein R represents an aromatic nucleus substituted by hydroxyl in one of the positions ortho and para to the bridge carbon atomand wherein the benzanthrone nucleus and the aromatic nucleus B may be further substituted, being when dry yellowish to brownish colored mostly crystalline owders, soluble in organic solvents of a hig er boiling point, soluble in concentrated sulfuric acid. with a red to brown to olive color, mostfrom about 100 to about 250 a benzanthrone compound having a free 2-position with an aromatic hydroxycompound having no substituents in one of the positions ortho and para to the hydroxyl group in presence of caustic alkalies. i

4. The process for manufacturing new condensation products of the benzanthrone series, which comprises heating at temperatures from about 100 to about 250 abenzanthrone compound having a free 2-position with an aromatic hydroxycompound having no substituents in one of the positions ortho and para to the hydroxyl group in presence of an amount of a caustic alkali not exceeding essentially the quantity, which is necessary for the formation of the akali salt of the hydroxycompound applied.

5. As a new product a condensation product of the benzanthrone series corresponding most probably to the following formula:

being when d a yellow crystalline powder, crystallizing f i'om nitrobenzene in bright yellow needles, soluble in concentrated sulfuric acid with a red color, in an alcoholic caustic soda solution with a red color and melting above 300.

" 6.- The rocess for manufacturing a new condensation product of the benzanthrone series, which comprises heating at elevated temperatures benzanthrone with ,B-naphthol in presence of caustic alkalies.

In testimony whereof, we afiix our signa- GEORG KALISCHER. HEINZ SCHEYER.

' tures. 

